practical: investigating the effects of exercise on breathing Flashcards
2.50
1
Q
what indicator do you use to compare the inhaled and exhaled air?
A
limewater or hydrogen- carbonate indicator
1
Q
what does the investigation compare?
A
the content of inhaled and exhaled air
2
Q
limewater in inhaled air and exhaled air?
A
- inhaled- stays colourless
- exhaled- turns milky white
3
Q
hydrogen carbonate indicator in inhaled air and exhaled air?
A
- inhaled- stays red
- exhaled- turns yellow
4
Q
how can you compare breathing rates before and after exercise?
A
- watching and counting the number of breaths someone takes in one minute at rest
- then exercise for 5 minutes- count the number of breaths they take in the first minute after exercise
5
Q
what else increases with breathing rate?
A
the depth of each breath
6
Q
why does the depth of each breath also increase?
A
its in response to the increased carbon dioxide in our blood
7
Q
because our breathing rate increases…
A
we excrete carbon dioxide more rapidly
8
Q
why can oxygen diffuse into the blood at a faster rate?
A
because there is a higher concentration gradient
